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Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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QA1
QA1 GM Pro Front Coil-Over System - Single Adjustable - 10in x 550lbs/in - Aluminum - Fits Select 1973-2004 GM
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
Fits select 1973-2004 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles, including El Camino, Monte Carlo, Malibu, S10, and Sonoma.
The QA1 GM Pro Front Coil-Over System is engineered to provide adjustable ride height and valving control for GM A-body, G-body, X-body, and S-series platforms. This kit features single-adjustable billet aluminum shocks that allow you to simultaneously tune compression and rebound valving with one knob to suit your driving style. The fully threaded shock body enables precise ride height adjustments for the perfect stance or improved corner weighting.
Paired with American-made lightweight high-travel springs, this system uses a specialized wire diameter and fewer coils to increase suspension travel while reducing unsprung weight. These components react faster than standard OE-style springs, optimizing handling for street performance, drag racing, and autocross. Each shock is 100% dyno tested and serialized at QA1's facility in the USA.
- Single adjustable valving for simultaneous compression and rebound control
- Lightweight billet aluminum threaded shock bodies
- 10-inch high-travel springs with a 550 lbs/in spring rate
- Direct bolt-in installation to factory mounting points
- Fully serviceable and rebuildable design
- Includes two (2) complete front coil-over assemblies
- Manufacturer Part Number: GS401-10550C
- Made in the USA
📘 Guides & Manuals
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1975 | Buick | Apollo | Base |
| 1975 | Buick | Apollo | SR |
| 1973-1977 | Buick | Century | Base |
| 1975-1977 | Buick | Century | Custom |
| 1976 | Buick | Century | Indianapolis 500 Pace Car |
| 1973-1975 | Buick | Century | Luxus |
| 1975-1977 | Buick | Century | Special |
| 1973-1987 | Buick | Regal | Base |
| 1988 | Buick | Regal | Custom |
| 1982-1983 | Buick | Regal | Estate Wagon |
| 1987 | Buick | Regal | GNX |
| 1984-1987 | Buick | Regal | Grand National |
| 1978-1988 | Buick | Regal | Limited |
| 1982 | Buick | Regal | Limited Turbo |
| 1978-1982 | Buick | Regal | Sport |
| 1976-1977 | Buick | Regal | SR |
| 1983-1986 | Buick | Regal | T-Type |
| 1975-1979 | Buick | Skylark | Base |
| 1978-1979 | Buick | Skylark | Custom |
| 1976-1979 | Buick | Skylark | S |
| 1978 | Buick | Skylark | Sport |
| 1975-1977 | Buick | Skylark | SR |
| 1973 | Chevrolet | Chevelle | Deluxe |
| 1973-1987 | Chevrolet | El Camino | Base |
| 1975-1977 | Chevrolet | El Camino | Classic |
| 1977-1978,1981-1986 | Chevrolet | El Camino | Conquista |
| 1973-1974 | Chevrolet | El Camino | Custom |
| 1979-1981 | Chevrolet | El Camino | Royal Knight |
| 1973-1987 | Chevrolet | El Camino | SS |
| 1978-1981 | Chevrolet | Malibu | Base |
| 1978-1982 | Chevrolet | Malibu | Classic |
| 1978-1980 | Chevrolet | Malibu | Classic Estate |
| 1978-1981 | Chevrolet | Malibu | Classic Landau |
| 1979-1980 | Chevrolet | Malibu | Classic Sport |
| 1979-1980 | Chevrolet | Malibu | Estate |
| 1979 | Chevrolet | Malibu | Landau |
| 1979 | Chevrolet | Malibu | Police |
| 1979-1980 | Chevrolet | Malibu | Sport |
| 1973-1974,1979,1981-1988 | Chevrolet | Monte Carlo | Base |
| 1983 | Chevrolet | Monte Carlo | CL |
| 1973-1974,1976,1978-1981 | Chevrolet | Monte Carlo | Landau |
| 1986-1988 | Chevrolet | Monte Carlo | LS |
| 1973,1975-1977 | Chevrolet | Monte Carlo | S |
| 1978,1980 | Chevrolet | Monte Carlo | Sport |
| 1983-1988 | Chevrolet | Monte Carlo | SS |
| 1975-1979 | Chevrolet | Nova | Base |
| 1976-1977 | Chevrolet | Nova | Concours |
| 1975,1978-1979 | Chevrolet | Nova | Custom |
| 1975 | Chevrolet | Nova | LN |
| 1975-1978 | Chevrolet | Nova | Police |
| 1977-1979 | Chevrolet | Nova | Rally |
| 1976 | Chevrolet | Nova | SS |
| 1991 | Chevrolet | S10 | Baja |
| 1982-2003 | Chevrolet | S10 | Base |
| 1982-1990 | Chevrolet | S10 | Durango |
| 1992-1993 | Chevrolet | S10 | EL |
| 1994-2004 | Chevrolet | S10 | LS |
| 1982-1989 | Chevrolet | S10 | Sport |
| 1994-1998 | Chevrolet | S10 | SS |
| 1982-1992 | Chevrolet | S10 | Tahoe |
| 1999-2003 | Chevrolet | S10 | Xtreme |
| 1994-2003 | Chevrolet | S10 | ZR2 |
| 2002-2004 | Chevrolet | S10 | ZR5 |
| 1981-1986 | GMC | Caballero | Amarillo |
| 1981-1987 | GMC | Caballero | Base |
| 1981 | GMC | Caballero | Conquista |
| 1981-1987 | GMC | Caballero | Diablo |
| 1981 | GMC | Caballero | Royal Knight |
| 1982-1990 | GMC | S15 | Base |
| 1987 | GMC | S15 | EL |
| 1983,1986-1988 | GMC | S15 | Gypsy |
| 1982-1990 | GMC | S15 | High Sierra |
| 1982-1990 | GMC | S15 | Sierra Classic |
| 1982 | GMC | S15 | Sierra Grande |
| 1991-1993 | GMC | Sonoma | Base |
| 1992 | GMC | Sonoma | GT |
| 1994-2004 | GMC | Sonoma | SL |
| 1991-2001 | GMC | Sonoma | SLE |
| 1993-2004 | GMC | Sonoma | SLS |
| 1973-1977 | GMC | Sprint | Base |
| 1975-1977 | GMC | Sprint | Classic |
| 1973-1974 | GMC | Sprint | Custom |
| 1975 | GMC | Sprint | High Sierra |
| 1976 | GMC | Sprint | Sierra Madre Del Sur |
| 1975-1976 | GMC | Sprint | SP |
| 1975,1977 | Oldsmobile | Cutlass | 442 |
| 1973-1975,1980 | Oldsmobile | Cutlass | Base |
| 1980-1981 | Oldsmobile | Cutlass | Brougham |
| 1977 | Oldsmobile | Cutlass | Colonnade |
| 1976-1977 | Oldsmobile | Cutlass | Colonnade S |
| 1980-1981 | Oldsmobile | Cutlass | LS |
| 1973-1977 | Oldsmobile | Cutlass | S |
| 1976-1979 | Oldsmobile | Cutlass | Vista Cruiser |
| 1979 | Oldsmobile | Cutlass | Vista Cruiser Brougham |
| 1973-1977 | Oldsmobile | Cutlass Supreme | Base |
| 1977 | Oldsmobile | Cutlass Supreme | Brougham |
| 1976-1977 | Oldsmobile | Cutlass Supreme | Colonnade |
| 1974-1975 | Oldsmobile | Cutlass Supreme | Cruiser |
| 1975 | Oldsmobile | Cutlass Supreme | Hurst |
| 1975-1979 | Oldsmobile | Omega | Base |
| 1976-1979 | Oldsmobile | Omega | Brougham |
| 1978-1979 | Oldsmobile | Omega | Brougham LS |
| 1977 | Oldsmobile | Omega | Deluxe |
| 1976-1977 | Oldsmobile | Omega | F85 |
| 1975 | Oldsmobile | Omega | Salon |
| 1976-1978 | Oldsmobile | Omega | SX |
| 1978-1987 | Pontiac | Bonneville | Base |
| 1978-1986 | Pontiac | Bonneville | Brougham |
| 1984-1987 | Pontiac | Bonneville | LE |
| 1978-1981 | Pontiac | Bonneville | Safari |
| 1973-1975,1978-1980 | Pontiac | Grand Am | Base |
| 1973-1974,1976-1987 | Pontiac | Grand Prix | Base |
| 1981-1987 | Pontiac | Grand Prix | Brougham |
| 1984-1987 | Pontiac | Grand Prix | LE |
| 1975,1977-1983 | Pontiac | Grand Prix | LJ |
| 1975-1980 | Pontiac | Grand Prix | SJ |
| 1973-1981 | Pontiac | LeMans | Base |
| 1973-1974 | Pontiac | LeMans | Luxury |
| 1973-1975,1977-1981 | Pontiac | LeMans | Safari |
| 1974 | Pontiac | LeMans | Safari Luxury |
| 1973-1977 | Pontiac | LeMans | Sport |
| 1977-1979 | Pontiac | Phoenix | Base |
| 1978-1979 | Pontiac | Phoenix | LJ |
| 1978-1979 | Pontiac | Phoenix | SJ |
| 1975-1977 | Pontiac | Ventura | Base |
| 1975 | Pontiac | Ventura | Custom |
| 1975 | Pontiac | Ventura | S |
| 1975-1977 | Pontiac | Ventura | SJ |
Choose your Location
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Atlus
1340 Cobb Dr, Unit 1, Eustis, FL 32736
352-234-4458
Mon – Fri: 8:30 am – 4:30 pm
Sat: 9:00 am – 2:00 pm
Sun: Closed
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QA1 GM Pro Front Coil-Over System - Single Adjustable - 10in x 550lbs/in - Aluminum - Fits Select 1973-2004 GM
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
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Fits select 1973-2004 Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles, including El Camino, Monte Carlo, Malibu, S10, and Sonoma.
The QA1 GM Pro Front Coil-Over System is engineered to provide adjustable ride height and valving control for GM A-body, G-body, X-body, and S-series platforms. This kit features single-adjustable billet aluminum shocks that allow you to simultaneously tune compression and rebound valving with one knob to suit your driving style. The fully threaded shock body enables precise ride height adjustments for the perfect stance or improved corner weighting.
Paired with American-made lightweight high-travel springs, this system uses a specialized wire diameter and fewer coils to increase suspension travel while reducing unsprung weight. These components react faster than standard OE-style springs, optimizing handling for street performance, drag racing, and autocross. Each shock is 100% dyno tested and serialized at QA1's facility in the USA.
- Single adjustable valving for simultaneous compression and rebound control
- Lightweight billet aluminum threaded shock bodies
- 10-inch high-travel springs with a 550 lbs/in spring rate
- Direct bolt-in installation to factory mounting points
- Fully serviceable and rebuildable design
- Includes two (2) complete front coil-over assemblies
- Manufacturer Part Number: GS401-10550C
- Made in the USA
📘 Guides & Manuals
🔧 Fitment & Compatibility
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1975 | Buick | Apollo | Base |
| 1975 | Buick | Apollo | SR |
| 1973-1977 | Buick | Century | Base |
| 1975-1977 | Buick | Century | Custom |
| 1976 | Buick | Century | Indianapolis 500 Pace Car |
| 1973-1975 | Buick | Century | Luxus |
| 1975-1977 | Buick | Century | Special |
| 1973-1987 | Buick | Regal | Base |
| 1988 | Buick | Regal | Custom |
| 1982-1983 | Buick | Regal | Estate Wagon |
| 1987 | Buick | Regal | GNX |
| 1984-1987 | Buick | Regal | Grand National |
| 1978-1988 | Buick | Regal | Limited |
| 1982 | Buick | Regal | Limited Turbo |
| 1978-1982 | Buick | Regal | Sport |
| 1976-1977 | Buick | Regal | SR |
| 1983-1986 | Buick | Regal | T-Type |
| 1975-1979 | Buick | Skylark | Base |
| 1978-1979 | Buick | Skylark | Custom |
| 1976-1979 | Buick | Skylark | S |
| 1978 | Buick | Skylark | Sport |
| 1975-1977 | Buick | Skylark | SR |
| 1973 | Chevrolet | Chevelle | Deluxe |
| 1973-1987 | Chevrolet | El Camino | Base |
| 1975-1977 | Chevrolet | El Camino | Classic |
| 1977-1978,1981-1986 | Chevrolet | El Camino | Conquista |
| 1973-1974 | Chevrolet | El Camino | Custom |
| 1979-1981 | Chevrolet | El Camino | Royal Knight |
| 1973-1987 | Chevrolet | El Camino | SS |
| 1978-1981 | Chevrolet | Malibu | Base |
| 1978-1982 | Chevrolet | Malibu | Classic |
| 1978-1980 | Chevrolet | Malibu | Classic Estate |
| 1978-1981 | Chevrolet | Malibu | Classic Landau |
| 1979-1980 | Chevrolet | Malibu | Classic Sport |
| 1979-1980 | Chevrolet | Malibu | Estate |
| 1979 | Chevrolet | Malibu | Landau |
| 1979 | Chevrolet | Malibu | Police |
| 1979-1980 | Chevrolet | Malibu | Sport |
| 1973-1974,1979,1981-1988 | Chevrolet | Monte Carlo | Base |
| 1983 | Chevrolet | Monte Carlo | CL |
| 1973-1974,1976,1978-1981 | Chevrolet | Monte Carlo | Landau |
| 1986-1988 | Chevrolet | Monte Carlo | LS |
| 1973,1975-1977 | Chevrolet | Monte Carlo | S |
| 1978,1980 | Chevrolet | Monte Carlo | Sport |
| 1983-1988 | Chevrolet | Monte Carlo | SS |
| 1975-1979 | Chevrolet | Nova | Base |
| 1976-1977 | Chevrolet | Nova | Concours |
| 1975,1978-1979 | Chevrolet | Nova | Custom |
| 1975 | Chevrolet | Nova | LN |
| 1975-1978 | Chevrolet | Nova | Police |
| 1977-1979 | Chevrolet | Nova | Rally |
| 1976 | Chevrolet | Nova | SS |
| 1991 | Chevrolet | S10 | Baja |
| 1982-2003 | Chevrolet | S10 | Base |
| 1982-1990 | Chevrolet | S10 | Durango |
| 1992-1993 | Chevrolet | S10 | EL |
| 1994-2004 | Chevrolet | S10 | LS |
| 1982-1989 | Chevrolet | S10 | Sport |
| 1994-1998 | Chevrolet | S10 | SS |
| 1982-1992 | Chevrolet | S10 | Tahoe |
| 1999-2003 | Chevrolet | S10 | Xtreme |
| 1994-2003 | Chevrolet | S10 | ZR2 |
| 2002-2004 | Chevrolet | S10 | ZR5 |
| 1981-1986 | GMC | Caballero | Amarillo |
| 1981-1987 | GMC | Caballero | Base |
| 1981 | GMC | Caballero | Conquista |
| 1981-1987 | GMC | Caballero | Diablo |
| 1981 | GMC | Caballero | Royal Knight |
| 1982-1990 | GMC | S15 | Base |
| 1987 | GMC | S15 | EL |
| 1983,1986-1988 | GMC | S15 | Gypsy |
| 1982-1990 | GMC | S15 | High Sierra |
| 1982-1990 | GMC | S15 | Sierra Classic |
| 1982 | GMC | S15 | Sierra Grande |
| 1991-1993 | GMC | Sonoma | Base |
| 1992 | GMC | Sonoma | GT |
| 1994-2004 | GMC | Sonoma | SL |
| 1991-2001 | GMC | Sonoma | SLE |
| 1993-2004 | GMC | Sonoma | SLS |
| 1973-1977 | GMC | Sprint | Base |
| 1975-1977 | GMC | Sprint | Classic |
| 1973-1974 | GMC | Sprint | Custom |
| 1975 | GMC | Sprint | High Sierra |
| 1976 | GMC | Sprint | Sierra Madre Del Sur |
| 1975-1976 | GMC | Sprint | SP |
| 1975,1977 | Oldsmobile | Cutlass | 442 |
| 1973-1975,1980 | Oldsmobile | Cutlass | Base |
| 1980-1981 | Oldsmobile | Cutlass | Brougham |
| 1977 | Oldsmobile | Cutlass | Colonnade |
| 1976-1977 | Oldsmobile | Cutlass | Colonnade S |
| 1980-1981 | Oldsmobile | Cutlass | LS |
| 1973-1977 | Oldsmobile | Cutlass | S |
| 1976-1979 | Oldsmobile | Cutlass | Vista Cruiser |
| 1979 | Oldsmobile | Cutlass | Vista Cruiser Brougham |
| 1973-1977 | Oldsmobile | Cutlass Supreme | Base |
| 1977 | Oldsmobile | Cutlass Supreme | Brougham |
| 1976-1977 | Oldsmobile | Cutlass Supreme | Colonnade |
| 1974-1975 | Oldsmobile | Cutlass Supreme | Cruiser |
| 1975 | Oldsmobile | Cutlass Supreme | Hurst |
| 1975-1979 | Oldsmobile | Omega | Base |
| 1976-1979 | Oldsmobile | Omega | Brougham |
| 1978-1979 | Oldsmobile | Omega | Brougham LS |
| 1977 | Oldsmobile | Omega | Deluxe |
| 1976-1977 | Oldsmobile | Omega | F85 |
| 1975 | Oldsmobile | Omega | Salon |
| 1976-1978 | Oldsmobile | Omega | SX |
| 1978-1987 | Pontiac | Bonneville | Base |
| 1978-1986 | Pontiac | Bonneville | Brougham |
| 1984-1987 | Pontiac | Bonneville | LE |
| 1978-1981 | Pontiac | Bonneville | Safari |
| 1973-1975,1978-1980 | Pontiac | Grand Am | Base |
| 1973-1974,1976-1987 | Pontiac | Grand Prix | Base |
| 1981-1987 | Pontiac | Grand Prix | Brougham |
| 1984-1987 | Pontiac | Grand Prix | LE |
| 1975,1977-1983 | Pontiac | Grand Prix | LJ |
| 1975-1980 | Pontiac | Grand Prix | SJ |
| 1973-1981 | Pontiac | LeMans | Base |
| 1973-1974 | Pontiac | LeMans | Luxury |
| 1973-1975,1977-1981 | Pontiac | LeMans | Safari |
| 1974 | Pontiac | LeMans | Safari Luxury |
| 1973-1977 | Pontiac | LeMans | Sport |
| 1977-1979 | Pontiac | Phoenix | Base |
| 1978-1979 | Pontiac | Phoenix | LJ |
| 1978-1979 | Pontiac | Phoenix | SJ |
| 1975-1977 | Pontiac | Ventura | Base |
| 1975 | Pontiac | Ventura | Custom |
| 1975 | Pontiac | Ventura | S |
| 1975-1977 | Pontiac | Ventura | SJ |
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